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Okay, thanks. Mostly it doesn't even move. So I'm pretty sure your answer is correct. For 3 week i never ever realized it can move. Suddenly today they make the circle.Homotrema rubrum, which are indeed foraminifera. Nothing to worry about, actually pretty cool imo. If you look really, really closely you should be able see tiny strands poking out of the shell. They feed on particulate matter.
Sorry i don't have better camera. That the best, but maybe i can take another angle later.Sorry @LisaAP they could also be vermetid snail. Which are a plague under the right conditions and a risk of injury to fish and aquarist maybe the op could supply a better pic under white ligh as they kinda look like homotrema also.
I would have to agree. They don’t look like any Vermetids I’ve seen and these used to be common on wild rock/coral skeletons back in the dayHomotrema rubrum, which are indeed foraminifera. Nothing to worry about, actually pretty cool imo. If you look really, really closely you should be able see tiny strands poking out of the shell. They feed on particulate matter.
A better photo might help but they don't look like vermatids to me. Sadly I have many of those so I know what they look like.Sorry @LisaAP they could also be vermetid snail. Which are a plague under the right conditions and a risk of injury to fish and aquarist maybe the op could supply a better pic under white ligh as they kinda look like homotrema also.